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Accounts Receivable
12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Accounts Receivable Accounts Receivable
Accounts receivable, net are summarized as follows ($ in millions):
December 31,
20212020
Trade receivables$208.9 $130.9 
Business tax credits, including VAT7.8 4.0 
Hedge contracts receivable0.4 0.3 
Other receivables22.3 14.4 
Less allowance for doubtful accounts and sales discounts(1.4)(1.1)
Total accounts receivable, net$238.0 $148.5